<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>左右摇晃的输入框</title>
    <link rel="stylesheet" href="201.css">
</head>
<body>
    <div class="container">
        <h1>请验证</h1>
        <input type="text" placeholder="请输入验证码" pattern="[0-9]*">
        <button>下一步</button>
    </div>
</body>
</html>